Design as applied to a helmet



FIG. 1 is a right side view of the design as applied to a helmet showing my design, the left side being identical;

FIG. 2 is a perspective view thereof;

FIG. 3 is another perspective view thereof; and,

FIG. 4 is a bottom view thereof.

The broken line showing a helmet and the words “E. Marinella—Napoli” are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a design as applied to a helmet, as shown and described. 